41. When overshadowed by a fish, the larvae are forcefully expelled, becoming ectoparasites on their unsuspecting host. 42. When our ancestors adopted group-dwelling social arrangements roughly 1.8 mya, ectoparasite loads increased dramatically. 43. Wood rats are believed to have evolved this behavioral adaptation to cope with the environmental stresses posed by ectoparasites . 44. However, imagines of the genus " Carnus " are blood-sucking ectoparasites of nestling birds. 45. It is an ectoparasite of fish in South America, including piranhas and " Pseudoplatystoma fasciatum ". 46. Smaller black surfperches can behave as cleaner fish, consuming ectoparasites from each other and from other fish species. 47. In addition, she and other scientists conducted a study of ectoparasites on the bat population of the savanna. 48. The sand tampan is an ectoparasite on humans, their livestock and wild animals, including birds and bats. 49. As of 2016, 25 species of " Herpomyces " had been identified as ectoparasites on cockroaches. 50. Angora goats are more susceptible to external parasites ( ectoparasites ) than similar animals, as their coats are denser.
